The cenozoic era was reffered to as the "age of mammals"
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Approximately nine million combatants and millions of civilians dead
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The United States refused to join the League of Nations because, according to a group of U.S. Senators, the League infringed on the sovereignty of the United States. ... Wilson refused to compromise with the moderates, and the Treaty with the League of Nations included was defeated in the Senate.
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The major impact of technology on World War I was that it made the war much more difficult for the infantry soldiers who did most of the fighting. ... The machine gun and the tank were new technologies that influenced WW1 the most. The machine gun lengthened the war and forced it to become a trench war
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